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And I think that with an 9 tooth drive gear, the car doesn't neet the adapter at all (like John's car).

That would be my guess as well. I don't have any data on 9 tooth drive gears utilizing a reducer. Each transmissions has a part# tag that designated its build configuration. If 9 tooth drive gear transmissions did not need adapter/reducer in high numerical gear applications then why wouldn't they install transmissions configured as such based on the part# tag. Assuming that the pn tag/brass tag in fact provided a configuration/BOM for the trans.

I was looking into if my car needs the adaptor and found this. My car has the same tag number as Johns. Z28 with 4:10. Should I also have the 9 and 25 combination? It appears when the 4:88s were installed my driven is the brown 18 tooth. I need to recount the driver I thought it was a 6 tooth. Good time to change before I have the transmission in! Are all drivers the same color?

going through a list of Window stickers in Jerry's book I found the following (probably a few more out there) I have listed what model they came in although there may be overlap none of these showed it.Would the ECL codes indicate the different transmissions? 3 ECL codes for the M20.One used with the Z28 3.73 to 4.10 One used with a L35 3.07One used with a L48 3.31

there were 2 for the M21 one with the Z28 3.73 -4.10 one with a L78 F70 14's 3.55

2 for the M22One used with a L72 F70 14's and 4.10One used with a Z28 and 3.73's